Arthur J. Gallagher & Co.
MX ˙ BMV ˙ US3635761097
SecurityMX:AJG / Arthur J. Gallagher & Co.
InstitutionCandriam Luxembourg S.C.A.
Latest Disclosed Ownership20,642 shares
Latest Disclosed Value $ 4,470,644
Candriam Luxembourg S.C.A. reports 1.68% increase in ownership of AJG / Arthur J. Gallagher & Co.

On April 30, 2026 - Candriam Luxembourg S.C.A. filed a 13F-HR form disclosing ownership of 20,642 shares of Arthur J. Gallagher & Co. (MX:AJG) valued at $4,470,644 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on April 30, 2026 disclosing 20,300 shares of Arthur J. Gallagher & Co.. This represents a change in shares of 1.68% during the quarter.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-04-30 2026-03-31 13F GALLAGHER ARTHUR J COM 363576109 20,642 342 1.68 4,471 -14.91 0.0232
2026-04-30 2025-12-31 13F/A-1 GALLAGHER ARTHUR J COM 363576109 20,300 -742 -3.53 5,254 -19.40 0.0262
2026-02-13 2025-12-31 13F GALLAGHER ARTHUR J COM 363576109 20,300 -742 5,254 0.0262
2025-11-06 2025-09-30 13F GALLAGHER ARTHUR J COM 363576109 21,042 -1,249 -5.60 6,518 -8.67 0.0341
2025-08-08 2025-06-30 13F GALLAGHER ARTHUR J COM 363576109 22,291 874 4.08 7,136 -3.49 0.0411
2025-05-14 2025-03-31 13F GALLAGHER ARTHUR J COM 363576109 21,417 -147 -0.68 7,394 20.82 0.0463
2025-02-07 2024-12-31 13F GALLAGHER ARTHUR J COM 363576109 21,564 -26,706 -55.33 6,121 -46.59 0.0352
2024-11-13 2024-09-30 13F GALLAGHER ARTHUR J COM 363576109 48,270 33,271 221.82 11,459 194.63 0.0658
2024-08-05 2024-06-30 13F GALLAGHER ARTHUR J COM 363576109 14,999 647 4.51 3,889 8.39 0.0236
2024-05-06 2024-03-31 13F GALLAGHER ARTHUR J COM 363576109 14,352 393 2.82 3,589 14.30 0.0229
2024-02-14 2023-12-31 13F GALLAGHER ARTHUR J COM 363576109 13,959 945 7.26 3,139 5.83 0.0217
2023-11-13 2023-09-30 13F GALLAGHER ARTHUR J COM 363576109 13,014 558 4.48 2,966 8.49 0.0210
2023-08-08 2023-06-30 13F GALLAGHER ARTHUR J COM 363576109 12,456 -12,658 -50.40 2,735 -38.17 0.0198
2023-05-12 2023-03-31 13F GALLAGHER ARTHUR J COM 363576109 25,114 -46,741 -65.05 4,422 -67.36 0.0307
2023-02-13 2022-12-31 13F GALLAGHER ARTHUR J COM 363576109 71,855 -38,392 -34.82 13,547 -28.24 0.0914
2022-11-10 2022-09-30 13F GALLAGHER ARTHUR J COM 363576109 110,247 49,358 81.06 18,877 90.16 0.1330
2022-08-03 2022-06-30 13F GALLAGHER ARTHUR J COM 363576109 60,889 49,705 444.43 9,927 408.29 0.0817
2022-05-13 2022-03-31 13F GALLAGHER ARTHUR J COM 363576109 11,184 2,235 24.97 1,953 28.66 0.0133
2022-02-10 2021-12-31 13F GALLAGHER ARTHUR J COM 363576109 8,949 0 0.00 1,518 14.14 0.0097
2021-11-09 2021-09-30 13F GALLAGHER ARTHUR J COM 363576109 8,949 18 0.20 1,330 6.31 0.0090
2021-07-20 2021-06-30 13F GALLAGHER ARTHUR J COM 363576109 8,931 0 0.00 1,251 17.91 0.0086
2021-04-29 2021-03-31 13F GALLAGHER ARTHUR J COM 363576109 8,931 0 0.00 1,061 -3.98 0.0088
2021-01-22 2020-12-31 13F GALLAGHER ARTHUR J COM 363576109 8,931 -1,187 -11.73 1,105 3.46 0.0087
2020-10-19 2020-09-30 13F GALLAGHER ARTHUR J COM 363576109 10,118 0 0.00 1,068 8.32 0.0100
2020-07-23 2020-06-30 13F GALLAGHER ARTHUR J COM 363576109 10,118 10,118 986 0.0104
2017-02-01 2016-12-31 13F GALLAGHER ARTHUR J COM 363576109 0 -12,806 -100.00 0 -100.00
2016-11-15 2016-09-30 13F GALLAGHER ARTHUR J COM 363576109 12,806 -1,354 -9.56 651 -3.41 0.0157
2016-07-26 2016-06-30 13F GALLAGHER ARTHUR J COM 363576109 14,160 14,160 674 0.0175
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.